Warning: Invalid argument supplied for foreach() - Gallery field

Hi,

I get the message ...

"Warning: Invalid argument supplied for foreach() in my_path/public_html/libraries/cms/html/select.php on line 571"

This happens when I am Cobalt back end and I try to edit a Gallery field.

Please note that it does not seem to be causing any problems and it's just a warning.

Thanks,

Dale.